linux-kernel - [PATCH 1/2] mutex: Better control mutex adaptive spinning config

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Message-Id: <1259783357-8542-1-git-send-regression-fweisbec@gmail.com>
Date:	Wed,  2 Dec 2009 20:49:16 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 1/2] mutex: Better control mutex adaptive spinning config

Introduce CONFIG_MUTEX_SPIN_ON_OWNER so that we can centralize in a
single place the conditions that determine its definition and use.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 kernel/Kconfig.locks |    3 +++
 kernel/mutex.c       |    4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index d1f86db..88c92fb 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -197,3 +197,6 @@ config INLINE_WRITE_UNLOCK_IRQ
 
 config INLINE_WRITE_UNLOCK_IRQRESTORE
 	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
+
+config MUTEX_SPIN_ON_OWNER
+	def_bool SMP && !DEBUG_MUTEXES && !HAVE_DEFAULT_NO_SPIN_MUTEXES
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 947b3ad..632f04c 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -148,8 +148,8 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
 
 	preempt_disable();
 	mutex_acquire(&lock->dep_map, subclass, 0, ip);
-#if defined(CONFIG_SMP) && !defined(CONFIG_DEBUG_MUTEXES) && \
-    !defined(CONFIG_HAVE_DEFAULT_NO_SPIN_MUTEXES)
+
+#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
 	/*
 	 * Optimistic spinning.
 	 *
-- 
1.6.2.3

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